Friction shock-absorbing mechanism



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S. B. HASELTINE FRICTION SHOCK ABSORBING MECHANISM 2 Sheets-Sheet 2 Filed June 8, 1925 vide a Patented Feb. 28, 1928.

srArES ineens Perser seien i afirma, ino., or ron or risanare-nii.

Application filed inne 8, 19525. Serial No. 35,680. p.

asssured quick release when the actuating' pressure is reduced.

Another object of the invention is vto promechanism of the character indicated lof avdouble ended type, of simple design, including co-operating friction elements and members and means for bringing the elements and members into intimate frictional contact during compression of the mechanism, including avspring resistance arranged for maintaining the friction elements centered.

A more specific object of the invention is to provide'a shock absorbing mechanism of the double ended typecomprising frontpand rear follower acting "casings having interior wedge faces Vco-operzrting with wedge-friction-shoes having frictional engagement with longitudinally disposed friction members which in turn engage front and rear spring followers co-operating with a main spring resistance, wherein the friction wedge-shoes and spring followers have inter-.engaging means for transferring the'resistance from the spring followers to .the shoes.

@ther and further .objects of the invention will more'fully and clearly appear from the description and claims hereinafter following.

n the drawings, forming apart of this specification, Figure l is a longitudinal, hori Zontal sectional view of a portion of a railway draft rigging showing my improvements in' connection therewith. Figure 2 is a vertical7 transverse sectional vie.' through theA underframe, to the innerfaces of whichv arel secured'frontstop lugs lll-ll and 'rear stop lugs 1,2*12 The innner `end portion of the drawbar is designated by 13, to which is oj-L leratively connected a hooded yoke le of well known form.` T he shock absorbing inschan'ism proper, including the front and rear follower casings is `disposed within the yoke VThe removable parts Aof the draft rigging are. supported in operative'posit-ionby a detachable' saddle spective draft sill l The. improved shock absorbing mechanism proper, as shown, comprises broadly, front and rear follower casings isf-A; front and plate l5 securedl `to the rey rear pairs of friction wedge-shoes B-B; a i

`pair of friction' elements CC; front and rear spring followers D-3g tandem arranged spring resistance elements E-E; and a retainer bolt F. l

` The front andrear follower casings AA areof like construction, each'heing in the form of a substantiallyrectangular box-like casting having spaced Vhorizontally disposed topvand bottom walls lr6-16,; vertically disposed spaced side w-alls 1-117 and a transverse outer endl wall. 18 adapted to co-operate with the corresponding stopV lugs in the manner of the usual follower. he side walls 17-'17 of each casting' A are .thickened ad*l jacentgthe outerend of the casting` and .are provided with concave interior walls 19-19. The transverse end wall 18 of each casing is Aso provided with a centrally 'disposed7 'inwardlyl y at opposite ends of the mechanism, each pair co-opcrating with one of the follower casings A.. As most clearly shownv in Figures l and /leacli friction shoe is in the form of an elongated heavy plate-like member 'having' la curved interior friction surface 22.of true cylindrical contour. At the outer end, each shoe also `has a convex side face 23. The rear end portion of thelshoe is provided with a lateral enlargement 2li having a iiat wedge face 121 .at the outer end thereof correspondingly inclined to and adapted to co-operate with one of the wedge `faces21 of theV corresponding casing A. As most clearly shown in Figure 4 the enlargement lof each shoe is also provided with a flat' side face, flat top and bottom faces and a fiat inner end face. In this connection it. is pointed out that when the mechanism is assembled each pair of shoes B has the c1 lindrical portions 23 'there of accommodatec between the curved walls 19 of the corresponding casing A and the enlargements 24: accommodated `within the square portion of the casing; a certain amount of clearance being provided between the side walls of the casings A and the adjacent walls of the shoes. At the outer end each shoe has a laterally projecting lange25 extending inwardly toward the axis of the mechanism, the flanges 25 of each pair of shoes co-operating with the corresponding` spring followerI B in a manner hereinafter described. l y `'The friction elements C which are twoin number, are arranged at opposite sides of the longitudinal axis of the mechanism and interposed between the front andrear follower casings. Each element'C is in the form `of a` relatively heavy, transversely curved plate having a longitudinaly disposed outer true cylindrical friction surface 122 adapted to co-operate with the friction surfaces 22 ofthe front and rear fric tion shoes B `at the corresponding side of the mechanism." Each element MlC is also provided with an interior concave friction surface 26 which is also of truev cylindrical form. Midway between the ends, each friction element is provided with an interior laterally projecting web 27, the webs 27 of the two elements C `being in tranverse alignment and forming central abutment means for the inner ends of the tanden arranged spring resistance elements E.

The spring followers D are tworin" number and are disposed at the ,front and rear end ofthe mechanism. "Each spring follower D is in the form of a relatively'heavy cylindrical block having anouter cylindrical friction jsurface 126 adapted to co-opei'ate with the4 interior frictionsurfaces 26 of the friction elements E. At the `outer end, each block D is centrally recessed as indicated at 2S to accommodate the boss 20 Aof the corresponding casing A. Y

The tandem arranged spring resistance elements Eliave their opposite'ends bearing respectively on the spring followers D and the webs 27 of the friction elements C. Each member of the tandem arranged springs comprises aheavy outer coil and a relatively lighter-inner coil.

Theinechanism is held in assembled rela tion and of overall uniform length by the retainer bolt F which has its opposite ends anchored to the hollow bosses 20V of the front and rear casings A respectively. The

shank vof the bolt extends .through alined openings in the front and rear spring followers D, the webs 27 being suitably out baclrto accommodate the sides of the shank on tliebolt.

The normal position of the parts is that shown in Figure l. In this position, the spring followers D have their outer ends bearing on theV inner walls ofthe Vflanges 25 of the corresponding pairs of front and rear friction shoes B,` the wedge faces of Y the shoes being held in intimate contact with the wedge faces of the corresponding casings A. In the normal position of the parts, sufficient clearance is left between the inner endsof the casings A to permit full compression of the mechanism, the casings being adapted to abut when Atliemechanism is fully compressed to form column elements Y,

toward each other'itliereby setting up -a wedging action between the same and the corresponding pair of frictionwedge shoes, forcing the fric-tion surfaces of all of the shoe-Sinto intimate friction contact `with the friction surfaces of the friction elements C, the latter being in -turn forced against tl-ie friction surfaces of the `front andrear spring followers D.` Inasinucli as the flanges 2 5 of the friction shoes B are in engagement with the outer ends of the corresponding spring followers, the latter will be forced l,tofapproach each other thereby compressing `the main spring resistance elements E. During the continued' relative approach of the front and rear follower casings A, the friction shoes at one end of the mechanism, together with the cor responding spring follower VD, `will be forced to slidev on the friction surfaces of the friction elements C. Due to the frictionalcontact between these parts, the elements C will also be forced to slide rela tively to the spring follower and 'friction slices associated with the other casing A.

During this action the friction elements C will be maintained substantially, centered between the front and rear follower easiiigs A due to` the action of the tandem arranged Springs 011 th@ Webs 27 of thefi'iction eleim ments. Y The described action will continue either until `the actuating force is reduced or the inner ends of the two follower casings come into abutment, whereuponthe actuatf i ing force will `be transmitted directly through the casingto the stop lugs ,of the draft sills as hereinbefore pointed out.

lili) When the actuating force is reduced the front and rear follower casings will be free to drop away fronithe friction wedge slices follower casings A willbe moved relatively ,9U

and I contemplate all changes and modifica tions that come within the scope of the claims appended hereto.

I claim:

1. In a friction shock absorbing mechanism, the combination with front and rear follower casings having interior wedge faces; a pair of longitudinally disposed friction members, each having abutment means thereon; front and rear spring followers having longitudinally disposed friction surfaces co-operating with saidv members; front and rear springs engaging said abutment means and co-operating with said spring followers; and front and rear sets of friction shoes interposed between said casings and friction members, said shoes having abutment means at the outer ends thereof co-operating with said spring followers.

2. In a friction shock absorbing` mechanism, the combination with front and rear followers each having inwardly acting relatively ixed wedge means associated therewith; of a pair of longitudinally disposed friction members interposed between said followers, said members being disposed aty opposite sides of the mechanism; front and rear springs for maintaining said members in centered position betweensaid followers; front and rear spring followers co-operating with said tandem springs, said spring followers having frictional engagement with said members; front and rear sets of friction shoes co-operating with said members and the wedge means associated with said front and rear followers;

3. In a friction shock absorbing mechanism, the combination with front and rear followers having inwardly acting wedge means movable therewith; of friction members interposed between said followers, said members being disposed at opposite sides of the mechanism and having inner and outer friction surfaces extending longitudinally of the mechanism; spring followers. at opposi te ends of the mechanism interposed between said members and having friction surfaces engaging the inner surfaces of the latter;

front and rear sets of friction shoes having wedge faces co-operating with said wedge means, said shoes having interior friction surfaces co-operating with the outer friction surfaces of said members; abutment means at the outer 'ends of said shoes 'bearing on the outer ends of said spring followers; and spring resistance means bctween said spring followers yand engaging said friction members to hold `rthe same centered between the followers. p

4l. In a friction shock absorbing mechanism, the "combination with front and rear followers relatively movable toward and from each other, each of said followers having inwardly acting Wedge means movable therewith; of a pair of friction members, each provided with longitudinally extending friction surfaces on the opposite sides thereof; a spring resistance co-acting with said members tohold the same centered between the followers; spring followers at the opposite ends of said members and co-operating with' one set of friction surfaces thereof; friction shoes on the outer sides of said members, said shoes (2o-operating with said wedge means; means on said shoes adapted to engage said spring followers for transferring the resistanceof said spring from the spring followers to the shoes.

5. In a friction shock absorbing mechanism, lthecombination with front and rear followers having interior wedge faces; front and rear sets of friction shoes having wedge faces co-operating with said casing wedge faces, said shoes also having interior cylindrical friction surfaces; a pair of longitudinally disposed friction members having cylindrical friction surfaces co-operating with friction surfaces of the shoes; front and rear spring followers engaging said shoes,

said spring followers having cylindricalv friction surfaces co-operating with corresponding friction surfaces on said members; and a main spring resistance interposed between said spring followers.

6.In a friction Vshock absorbing mechanism, the combination with front andrear follower casings each having inwardly acting relatively fixed wedge means associated there'- with; of a pair of longitudinally disposed transversely curved friction members, said members being disposed at opposite sides of the longitudinal axis of the mechanism;

front and rear sets of friction wedge shoes interposed between said vmembers and the respective follower casings; spring followers engaging said shoes and having frictional engagement with said members; and means for yieldingly resisting relative movement of said spring followers. y

7. In a shock absorbing mechanism, the

combination with front'and rear stop members; of a pair of relatively movable casings co-operating relatively with said front and rear stop members; a yoke enclosing said casings; a pair of longitudinally disposed friction elements interposed between said casings; friction wedge shoes interposed bel Si) tween each casing and said friction elements; a pair of spring followers engaging said shoes and having friction engagement with said vfriction elements, said elements, and 5 spring followers having 3o-operating;- curved friction surfaces and said elements and shoes also having cofoperating curved friction surfaces; and a main spring resistance interposed between the Spring followers.

In witness that I claim the foregoing I 10 have hereunto subscribed my name this 1st day of June 1925.

e STACY B. HASELTINE.' 

